How do I reply to discussion threads?

I submitted support tickets that i was told to respond on a thread but have been unable to post/or respond to my own threads. When I click on my activity links, I see the response to my question but no where for me to reply back.

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Hello Vinod,
Glad I found this thread, because I had trouble replying to one of my threads today too. However, this is still a bit confusing because the icon in the screen shot in this thread is not the same as the one on the actual website. I figured it out, but with the new look of the website, the sign up button and the new icon don't look like a place to sign in. In fact it looks like I am already signed in because my name and picture are on the thread header.
Just wanted you to know that it it confusing to more than one of us. And maybe a whole bunch of us.
Thanks,
Jon

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